Purveyors of so-called Complementary and Alternative Medicine (CAM) don’t have any credible scientific evidence.
If they did, their treatments would not be called “alternative” but would have been accepted into mainstream practice and would just be called “medicine” (as in the old joke, “Do you know what you call alternative medicine with evidence? Medicine.”). They tend not to appreciate science or even to understand it. They don’t need or want scientific evidence. For them, testimonials are all-powerful and are all the evidence they ask for.